Air compressor



July 19, 1927. 1

J A. DAVEY ET AL AIR COMPRESSOR Filed March 1 19125 3 Sheets-Sheet 1 INVEN'SOR m-ifii 11: 11

July 19, 1927.

J. A., DAVEY ET AL AIR COMPRESSOR Filed March 16 1925 a Sheets-Sheet INVENTOR R DM D |!|.!im a L r iiilll ll.l-l-l-l W 5 0 3 m 4 3 lllllllllllllll ..|||||||1||||l.fl|..

[J l v I u w 7 i I 3 H N MWE j 7 W 3 July 1927' J. A. DAVEY ET AL AIR COMPRESS 0R Filed March 16, 1925 5 Sheets-Sheet 3 Patented July 1 9, 1927.

UNITED STATES 3m! nan: IIAVEY, 01 SOUND BEACH,

1,636,291 PATENT OFFICE.

CONNECTICUT, AND PAUL H. DAVEY AND I mamas L. savanna, or KENT, x10; sun caveman. ASSIGNOB or HIS nn'rmn RIGHT T0 In DAVEY 'r 1: mam oomrm, or xmrr, 0x10, 4 conrom'rxon OI OHIO.

This invention relates to air compressors, and particularly to an air compressor of the portable type adapted to be coupled with an automotive vehicle for driving the comressor. This application is a continuation in part of our application Serial No. 7 03,098, filed March 31, 1924:.

A'portable air compressor of this type is of great value for supplying portable air l driven tools, as, for exam 1e, saws, chippin tools, riveters, or the ike, and is partic arly useful where the tools must be taken to the work.

We provide an air compressor of simple and rugged construction which may be attached to the frame of an automotive vehicle and operative connection made to the engine thereof for driving the compressor.

As the vehicle is always stationary when the compressor is in use, we provide auxiliary cooling means for the engine and also pro vide for cooling the compressor. We have found that it is highly desirable fo provide this additional cooling means as the compressor imposes a heav load on the en gine and the efliciency of t e cooling means usually provided is reduced byreason of the fact that the vehicle is. standing stationar In apparatus of this character it is high y desirable to keep the construction as light as is consistent with good constructlon, and we have found that the ordinary valve mechaa this character.

nism will not stand up under the severe conditions imposed u on portable apparatus of e therefore construct the cylinder heads and adjacent portions of the apparatus of a metal having very high ther- .mal conductivity, as, for example, alumi=' num, and provide for discharging air outwardly against the inner surface of this head. We have found that the particular construction which we employ is highly desirable in this form of compressor and gives exce tionally good results.

WE prefera ly employ an air compressor having two opposed cylinders but have found that in any event the intermittent loadimposes an extremely heavy load upon the connection between the compressor and the en me. We have found that where an unyie ding connection is employed the parts will break and very unsatisfactor results are obtained. We rovide a flexi le driving connection in'wliich may also be incoram commson.

porated a clutch for connecting or. nectm the compressor and the engine.

Application mm 1mm 16, 1025. Serial m. 15,111. HE'JJ In t e accompan ing drawings, illustrating the present pre erred embodiment of our invention: c

Figure 1 is a front view, part1 broken away, of the present referred em odiment of our invention, and s owing the manner of connecting the sameto the frame; work' of an automotive vehicle,-

7 Figure 2 is a vertical section on the line II-II of Figure. 1

Figure 3 is a side elevation ofa connect- 1ng member used for attachin the compressor to the frame work of t e automotive vehicle;

Figure 4 is a section Figure Figure -5 is a section on the line V:V .Of

on the line IVIV of Figure 25 igure 6 is a view to an enlarged scale ofthe valve mechanism shown. intthe right hand portion of Figure 1;

Figure 7 is a section on; the .line VIIVII of Figure 6;\, I

Figure 8 is a view" to an enlarged scale of the1 clutch mechanism shown in Figure 2; Figure 9 is an end view of the structure shown in Figure 8.- i

In the illustrated embodiment 6f the, in vention there is provided a',crank case 2' having a pair of coaxial cylinders 3 attached thereto. The cylinders are provided with pistons 4 connected to a crank pin 5 by connecting rods 6. carried" between two flywheels 7 and 8, the

flywheel 7 being secured to ashaft 9i adapted to make power connection with the engine of an automotive vehicle andthe fly: wheel 8 being connected to a shaft. 10 for driving the air compressor and cooling fan.

Each cylinder is provided withla head 11 and a valve plate 12 interposed between the head and the end of the cylinder 3 said head and said valve plate constitutin a removable end closure for the cy inder. Bolts 13 pass through the flange 14 and are threaded into the head 11 to secure the parts in place.

The head 11 is provided with a conical portion 15 terminating in an air inlet opening 16. 'The valve plate 12 lies across this The 'crank pin 5 is 17 Air inlet openings 18 are provided and the inlet valve is in the form of a flat ring 19. The valve 19 is pressed against the openings 18 by springs 20. Each of these springs is carried in an'arm 21, the several arms being integral with a bolt 22 secured in the valve plate 12 by. a nut 23. A washer 24 is provided for spacing the arms away from the valve seat and this washer also effective for guiding the valve 19. On a suction stroke of the piston, air is drawn through the openings 18 past the valve 19 into the cylinder. On the compression stroke the compressed air passes outwardly through ports 25 past a valve plate 26. This plate is held against the valve seat by springs 27, the springs being carried by a r1ng 28 which is threaded onto the valve plate 12 as shown. The compressed air escapes into the head around the outside of the ring 28 and also through ports 29 provided therein.

While it is necessary to make the valve plates 19 and 26 and also the springs used.

in connection therewith of steel, it is preferred to make the remainder of the head from a metal having a high heat conductivity, such as aluminum. A difficulty which has always been experienced heretofore in portable air compressors has beenthe proper cooling of the valve structure, and the form shown in the drawings has given exceptionally good results. Not only is the head made of aluminum, which is of high heat conductivity, but this head is also provided with cooling fins 30. When the air is discharged around the outside of the ring 28, it strikes the aluminum wall of the head and a large portion of the heat of the compressed air is thereby removed. Similarly, any air passing through the ports 29 strikes against the walls of the conical portion 15 and isv thus cooled. In addition to this the passage of cooled air through the opening 15 to the inlet valve aids materially in maintaining the valve mechanism at proper temperature.

Each of the heads is provided with an out let 31 for compressed air and these outlets are connected by a cross pipe 32 which also is preferably provided with cooling fins. The cross pipe 32 in the preferred form of our invention is made of aluminum, as it is found that this aids in maintaining the desired low temperature.

The various parts of the compressor are readily accessible, as will be apparent from Figure 1. If the screws 13 holding the heads on the cylinders and the screws 33 holding the cross pipe to the heads are removed, a

head may be removed, .together with its valve, for inspection or repair. The several parts of the valve may be quickly replaced so that even in the event of a break-down very little time will be consumed in putting the apparatus back into working condition.

A breather pipe 34 is provided for the crank case and an oil sight 35 is also provided.

The air compressor is secured to the vehicle frame by a connection plate 36' rigidly secured to the crank case 2. A air of attachment members 37 are provide and are permanently secured in the channels 38 comprising a frame of the vehicle. They are provided with flanged and threaded ends 39 \pow'er shaft is extremely irregular, there is always a tendency for power connection to crystalize and break unless some flexibility is provided therein. We accordingly make a flexible connection between the shaft 9 and the engine shaft 41 of the vehicle. A connection sleeve 42 is provided and to this is fastened a shaft 43 projecting through the opening usually provided adjacent the radiator for the engine crank. In the well known Ford automobile a pin is generall provided through the head end of the cranli shaft for engagement by the crank. In making a connection to this type of engine, weremove this cross pin and provide dog point set screws 44 in the sleeve 42 which fit into the holes thus provided in the'crank shaft 41. In order to make an extremely tight oonnection with the shaft we also provide draw into the space required for the shaft 41. The

central opening of the sleeve is then bored out, leaving a notch in each of the bolts 45, and after the sleeve is placed on the shaft the bolts are drawn up tight by nuts 46. It is found that this exerts a spring clamping action on the shaft and prevents any play at this point.

The shaft 43 is provided with a spider 47 to which are bolted one or more flexible connecting disks 48. These disks are preferably made of fabric impregnated with rubber, such as are used in the well known Thermoid-Hardy universal joint. The disks 48 are secured to the spider by spaced apart.

bolts 49 and intermediate them bolts 50 are provided for securing to the ring a drum 51. Surrounding the drum 51 is a band 52 which -is preferably provided with a suitable lining, such as brake lining 53. The band 52 this bolt engages connection mem rs 59 secured to the band 52. The plate 56 is secured to the shaft 9, and it will be seen that when the bolt 58 is tightened there will be provided a driving connection between the engine shaft 41 and the air compressor. When the bolt 58 is loosened the driving connection is broken and the vehicle may be operated in the ordinary way. 'It is not, however, necessary to remove the compressor and the apparatus may be moved from place to place and then the compressor very conveniently put into operation. When the bolt 58 is loosened springs 60 and 61 tend to hold the lining 53 away from the drum, so as to prevent heating. This clutch connection is particularly described and claimed in our copending application Serial No.- 15,716, filed of even date herewith.

The load imposed on the automobile engine of a large compressor is such that the ordinary cooling system is not sufficient to maintain the engine at suitable running temperature. We therefore provide an auxiliary cooling fan 62 which is mounted in front of the radiator 40. This fan is carried on a shaft 63 having a belt pulley 64 adapted to be driven through a belt 65 from a pulley 66 mounted on the shaft 10. The shaft 63 is carried in a bearing member 67 which is eccentrically mounted in a bracket 68 and secured therein by bolts 69. This provides a convenient means for tightening or loosening the belt 65, as may be required.

We provide an air compressor of simple construction which may be readily attached to an automotive vehicle. The head and valve structure insures thorough cooling and is found in practice to give exceedingly good results. The cooling fan provided maintains the engine at the desired temperature and materially improves the operation of the entire apparatus. The valves are very simple and accessible and their construction and arrangement is practically desirable in a compressor of this type.

While we have illustrated one embodiment of our invention, it is understood that it is not limited thereto but may be otherwise embodied within the scope of the. following claims:

We claim:

1. An air compressor including a cylinder, an end closure therefor, valves for passages in said. end closure, and means providing a metallic path of high heat conducting quality' and. capacity from said valvesto the exterior of the compressor.

2. An air compressor including a cylinder, an end closure therefor, valves in said closure, and means providing a metallic ath of high heat conducting uality'and a equate capacity includingan a uminum valve late extending outward to the exterior o the compressor.

3. An air com ressor including a cylinder, and a detacha le aluminum end closure therefor said end closure having valveseats therein and providing a path of high heat conducting quality and capacity to atmosphere.

having a head and a valve plate interposed between the cylinderand the head, both the head and the valve plate being made of a metal of relatively high heat conductivity.

.5. An air compressor including a cylinder having a head and a valve plate interposed between the cylinder and the head, both the head and the valve plate being made of a metal of relatively high heat conductivity, the head having cooling fins thereon.

6. In combination with an automotive vehicle having a radiator, an air-cooled air compressor of large capacity requiring the motor to be run under heavy load conditions said compressor being mounted adjacent the radiator, a driving connection between the engine of the vehicle and the compressor, and a fan mounted on the compressor in front of the radiator.

.7. In a combination with an automotive vehicle having an internal combustion engine and a main driving shaft thereof, an air compressor of large capacity requiring the engine therefor to be run under heavy load conditions said compressor mounted on said vehicle and having a driving-shaft arranged in alinement with said engine shaft, and a flexible coupling connecting said shafts comprising a flexible disk attached to one of the said shafts, a drum around the periphery of the'disk, a flexible band connected to the other shaft and adapted to cooperate with the drum, and means for positively clamping the band around the drum to form a normally non-slipping driving connection, substantially as described.

8. In a combination with an automotive vehicle having an internal combustion engine and a main driving shaft thereof, an air compressor of large capacity requiring the engine therefor to be run under heavy load conditions said compressor mounted on said vehicle and having a driving shaft arran ed in alinement with said engine shaft, an a flexible coupling connecting said shafts comprising a drum secured to one of said shafts and serving as one member of a clutch, a releasable clamping band encircling the drum and serving as the other member of the clutch, means to force the clamping band positively into clamping relation with said drum, supporting means for the band fixed to the other shaft, and a flexible disk interposed between one of the clutch members and its shaft.

In testimony whereof we have hereunto set our hands.

JAMES ABRAM DAVEY. PAUL H. DAVEY. CHARLES L. GAUGLER.

' 4. An air compressor including a cylinder 

